Aveiro weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: June – September
What is the weather like in Aveiro in September?
In September, Aveiro is warm: daytime highs average 25 °C, and nights cool down to about 16 °C. The sea averages 18.1 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain falls on about 6 days, adding up to 54 mm. All in all, September is a good month for a holiday in Aveiro.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 79 | 73 | 32 |
| Day | 27° | 25° | 21° |
| Night | 17° | 16° | 14° |
| Sea | 18° | 18° | 18° |
| Sun | 10 h | 8 h | 5 h |
| Rain days | 3 | 6 | 13 |
More details for September
- Daylight
- 12 h 32 min07:14 – 19:46
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 20 km/haverage daily peakAll months
- Cloud cover
- 42 %on averageAll months
- Hot days
- 4 days30 °C or moreAll months
- Time zone
- UTC+1Europe/Lisbon
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %16 %
- Sunshineweight 20 %83 %
- Few rainy daysweight 20 %85 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
Aveiro in September: quick answers
Is Aveiro hot in September?
Warm rather than hot: in September, daytime highs in Aveiro average 25 °C and nights cool to about 16 °C. On about 4 days the thermometer climbs to 30 °C or more.
Can you swim in Aveiro in September?
Only if you don't mind cold water: in September the sea averages just 18.1 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Aveiro in September?
Rain falls on about 6 days, adding up to 54 mm.
Aveiro month by month
The whole year in AveiroAll destinations: PortugalWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences